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US Patent 7843565 Optical gas monitor

Patent 7843565 was granted and assigned to California Institute of Technology on November, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A frequency modulated spectroscopy system, including a photo-detector, a band-pass filter to filter the output of the photo-detector, and a rectifier to demodulate. The band-pass filter has a relatively high Q factor. With the high Q factor band-pass filter and rectifier, a reference sinusoid is not required for demodulation, resulting in phase-insensitive spectroscopy. Other embodiments are described and claimed.

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